Automatic height gauge tapper



May 23, 1944. J. F. McQUlLLAN, SR

AUTOMATIC HEIGHT GAUGE TAPPER 2 Sheets-Sheet 1 Filed May 7, 1942 EE EEEE E av. hm,

Patented May 23, 1944 UNITED? .oF Fics AUTGMATIUHEIGHT GAUGE TAPE-ER Jeha-ri mouiuan, Sr., Ea'st' OrangeiNi J. Application 7, 1942,- .Serial No. 442-109 s Glairiis. (Oil-"33 48355 This invention-relates to aelayout punchland automatic height-gauge tapper.

One important object of the invention; isto provide 3 a layout punch having a -con-ical point whose center is exactly in linewith the baseof the "punch holder.

Another object-is to provide such apunch' as will fita vernierhei'ght 'gauge and will prick a mark in metal as accurately as a vernier height gauge can be set, preferably with the aid'of a novel automatic height gauge tapper adapted to fit over the height gauge.

I further aim to provide the punch of such nature that it may be used as a scratch inthe vernier height gauge,

Various additional objects and advantages will become apparent from a consideration of the description following taken in connection with ac-- companying drawings illustrating an operative embodiment.

In said drawings- Figure 1 is a plan view tapper;

Figure 2 is an end elevation showing such height gauge tapper in connection with the punch, height gauge and work;

Figure 3 is a view taken approximately on the plane of line 33 of Figure 1 with a punch and work suggested;

Figure 4 is a plan view of the punch;

Figure 5 is an end elevation showing the punch used in connection with a supporting gauge and Work;

Figure 6 i a view taken on the line 6-6 of of the height gauge Figure 5;

Figure 7 is an inverted plan view of the punch;

Figure 8 is a central longitudinal sectional view through a modified construction of the punch, and

Figure 9 is an elevation of work.

Referring specifically to the drawings wherein like reference characters designate like or similar parts, I provide a novel center punch having a body or stock l provided with a fiat under surface i I. The stock III has a depending lug l2 provided, as shown in Figures 2, 3, 4, and '7 with an integral punch element l5, or, as in Figure 8, with a hole or passage l3 which receives the shank I4 of a point or punch element I5. It will be noted that such element is truly conical and that its center is in the plane of the flat bottom wall ll. Stock Ill may have any desired number of openings 16 therethrough of a block or piece Such backing is shown gaug 18 carried by abase l9 and which base is capablev of slidingfin;alldirections over its sup .porting surfice; A yoke or olamp-2ll is fastened to" the slide I7 and the center punch 'passes through the latter being secured therein by a binding screw 2| carried by the clamp. The center gauge is shown in Figures 2 and 3 in operative relation to a metallic block or other work 22 maintained at the desired elevation by block 23, and clamped or fastened to a conventional backing 24 by means of a clamp 25. of L-shap and in turn is secured to a support as by means of a clamp 23.

The punch l0 may serve as a scratch by moving the same or the vernier height gauge to which it is attached in a horizontal plane. The block 22 may be shifted degrees from the position shown in Figure 2 and the punch again used as a scratch, to intersect the scratch first made. Since the element I5 is truly conical, the scratches will be truly of V-shape. After the scratching, the point l5 will be located at the intersection of the scratches to receive a blow to give the necessary prick mark.

I employ an automatic gauge tapper which has an open frame or loop 2'! which fits over the vernier height gauge as shown in Figures 2 and 3. This loop 21 at one end is spanned by a pin 28 on which a roller 29 is journaled and which roller may be placed in contact with the end of the center gauge I0. Loop 2! is detachably secured by a screw 30 to a stud 3! over the outer end of which a slidable head 32 is telescoped. being mounted and positioned by a screw 33 fastened to the stud 3| and passing through an elongated slot 34 on the head. Stud 3! and head 32 are normally held extended by an expansive coil spring 35 located in the hollows thereof. Head 32 may be slid inwardly into abutment with the outer end of the stud 3i and a hammer or other blow then dealt against the outer end of the head to slightly drive the center punch and produce the prick in the metal. Head 32 has a vent passage 36 leading from its hollow to the exterior.

It will be clear that the vernier height gauge is conventional and that the slide l1 thereof is raised and lowered in the conventional or usual manner.

In Figures 5 and 6, the block or work 22 is engaged against the same backing 24 as in the other figures and which is held in place by the same clamp 26, Th center punch is the same as in the preceding figures and the same reference numerals have been applied thereto. In this instance, the center punch rests on or is supported by a planer gauge 31 although it may be supported on standard gauge blocks or otherwise. The punch may be used as a scratch gauge in this instance as in the preceding instance and the block 22 may be turned 90 degrees so-that intersecting scratches may be effected so that point I5 may be used to prick the same at the. 1;

point of intersection. In this instance, a hammer or other tool 38 may be used to deal'ablow against the outer end of the cen ter. gauge as suggested in dotted lines in Figure 5.

As a result of the invention, the prick mark may be made as accurately as the Vernier height gauge or other gauge or support can be set. The work can be set in a lathe with a test indicator to determine the accuracy of the prick mark and the hole can then-be bored. Also, the prick mark may be used as a center in drilling in a drill press with a small drill and in -many other ways knovm to tool and diemakerss Various changes may be resorted to provided they fall within the spirit and scope of the inand 1a connection between delivery of a blow imparted to the tapper, said tapper comprising relatively slidable sections, spring means urging separation of the sections I the sections holding them together and guiding their relative move- 1 ment.

3. tapper mechanism for a center punch mounted on the slide of a gauge, a tapper, a loop thereon having an opening whereby it may embrace the slide and contact the punch upon deliveryof a blow imparted to the tapper, roller means carried'by the loop to directly engage the center 'punch; astud extending from the loop, a head telescoped over the stud, and an expansive spring within the stud and head, i I "JOHN F. McQUILLAN, SR. 

